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## Re: I am trying to enter a function and input multiple variables

**From**: |
Maynard Wright |

**Subject**: |
Re: I am trying to enter a function and input multiple variables |

**Date**: |
Sun, 03 Jul 2016 16:54:27 -0700 |

**User-agent**: |
KMail/4.13.3 (Linux/3.16.0-30-generic; KDE/4.13.3; i686; ; ) |

On Sunday, July 03, 2016 03:19:44 PM naryana.shankara wrote:
>* I have 2 functions:*
>* (cot(x))-1*
>* (cos(2*(x)))/((1+(cot(x)))*(sin(x))^2)*
>* and I need to enter the same values and compare the outputs. This is a loss*
>* of significance problem for a math class.*
>* The values are*
>* (pi/4),((5*pi)/4),((3*pi)/4) and ((7*pi)/4)*
>* *
>* my code is*
>* clear all*
>* A=(cot(x))-1*
>* B=(cos(2*(x)))/((1+(cot(x)))*(sin(x))^2)*
>* x=[(pi/4),((5*pi)/4),((3*pi)/4),((7*pi)/4)]*
>* x*A*
>* x*B*
>* *
>* my output is*
>* *
>* >>>error: `x' undefined near line 2 column 8*
>* *
>* error: evaluating argument list element number 1*
>* error: called from:*
>* error: /home/shankara/Documents/M365/HW2P2.m at line 2, column 2*
>* *
>* I know I am doing something like comparing a function with a vector and*
>* octave is grumbling.*
>* *
>* What am I doing wrong and what should my code look like?*
>* *
>* thanks*
>* *
I can run your code successfully with two changes:
1. I moved the line defining x so that x is defined before I run the lines for
A and B;
2. In the line for B, I prefixed the various operators with "." to indicate
that I wanted operations on individual elements of each matrix, not matrix
operations:
B=(cos(2.*(x)))./((1.+(cot(x))).*(sin(x)).^2)
I probably didn't need all of those, for the plus sign for instance, but it is
sometimes easier just to use the period as a prefix for every operator when you
don't want matrix manipulations.
Maynard Wright